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CATHODE RAY OSCILLOSCOPE NOTES

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CATHODE RAY OSCILLOSCOPE NOTES

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  • October 18, 2022
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  • 2022/2023
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1.5CATHODE RAY OCLLOSCOPE (CRO)
ACRO iS an instrument for plotting one varying physical quantity -p.d, sound, and
beat-against current, displacement or time.
pressure,
The following are the main parts of the CRO
heart



(a) Electron gun
The gun comprises an indirectly heated cathode C, a grid G, and the two anodes Al and A2. C has
a negative voltage with respect to C, and controls the mumber of electrons reaching A from C. The
brightness of the screen S, is controlled by cotrolling the vollage on G; ie. if the voltage is made
less negative, then the brightness increases. The anodes have positive potential relative to C. They
accelerate the electrons to a high speed down the tube (A2-1000V, Al=-200 to 300V and G is
between -50V to zero)

(b) Deflecting system
The beam from A2 passes first between a pair of Y-plates and X-plates, which deflect the beam
vertically and horizontally respectively.

() Fuorescent Screen
The screenS is coated with a phosphor such as zinc sulphide, which produces light or fluorescence
when struck with fast moving electrons.




Electron beam

Sceen
Cathode =


Graphite ooating

Evacuáted gass



(d) Time base
When the voltage is applied to the Y-plates, the electron beam is deflected to the vertical. To trace
the wave-form of the voltage applied to the Y-plates, the X-plates are used to provide the time-axis.




Chatterbox tin




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Uses of the CRO
1. Measures a.c and d.c voltages

2. Measures frequencies
3.4. Measures phase ditferences
Measures sinall time diferences.

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